fixed and re-activated test-script testComputeAntennaPattern.sh

- awk usage of '**' operator seems non-portable
- refs #1119
Rename testGridv2.sh to testCFSv2_grids.sh

- consistent with other CFSv2 test names
- renamed reference test results appropriately
series.make_psd_xmldoc():  set Name on LIGO_LW parent

- also teach read_psd_xmldoc() how to find the element by name.